stm32: fix DAC examples

The DAC driver defaults to enabling the channel trigger, but leaves it
at the default value of TIM6 TRGO, then performs a software trigger
after writing the new output value. We could change the trigger
selection to software trigger, but for this example it's simpler to just
disable the trigger.

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/stm32f4/src/bin/dac.rs b/examples/stm32f4/src/bin/dac.rs
index 3a6216712..aaedcfecc 100644
--- a/examples/stm32f4/src/bin/dac.rs
+++ b/examples/stm32f4/src/bin/dac.rs
@@ -14,11 +14,11 @@ async fn main(_spawner: Spawner) -> ! {
     info!("Hello World, dude!");
 
     let mut dac = DacCh1::new(p.DAC, NoDma, p.PA4);
+    unwrap!(dac.set_trigger_enable(false));
 
     loop {
         for v in 0..=255 {
             unwrap!(dac.set(Value::Bit8(to_sine_wave(v))));
-            dac.trigger();
         }
     }
 }